Method and apparatus for forming a barrier metal layer in semiconductor devices
View Patent ↗A method and apparatus for forming a barrier metal layer in semiconductor devices are disclosed. A disclosed method for forming a barrier metal layer in a semiconductor device forms an interlayer insulating layer on a front face of a semiconductor substrate having a contact area and patterns the interlayer insulating layer to open the contact area. The disclosed method further places the semiconductor substrate in a chamber, injects reactant gas and precursor into the chamber, transforms the gas into plasma gas and causes the plasma gas to react with the precursor to form a single TiSiN film covering the contact area.
1. A method for forming a barrier metal layer in a semiconductor device, comprising:
forming an interlayer insulating layer on a front face of a semiconductor substrate having a contact area;
patterning the interlayer insulating layer to open the contact area;
placing the substrate in a chamber having a process space divided into a first section and a second section by a partition, wherein the partition includes a plurality of through holes;
injecting reactant gas into the first section and precursor into the second section;
transforming the reactant gas into plasma gas; and
causing the plasma gas to react with the precursor to form a single TiSiN film covering the contact area wherein the holes allow selective passage of reactant gas that is transformed into plasma toward the second section in order to minimize plasma damage and unnecessary impurities to the semiconductor substrate.
2. A method as defined in claim 1 , wherein the substrate is placed in the second section of the chamber.
3. A method as defined in claim 1 , wherein the precursor is vaporized before being injected.
4. A method as defined in claim 1 , wherein plasma-based gas is further injected into the first section.
5. A method as defined in claim 4 , wherein the plasma-based gas is N 2 +Ar or N 2 +H 2 .
6. A method as defined in claim 1 , wherein the precursor is one of Tetra Di-Ethyl Amido Titanium (TDEAT) and Tetra Di-Methyl Amido Titanium (TDMAT).
7. A method as defined in claim 1 , wherein the reactant gas comprises SiH 4 and NH 3 .